A zoetrope is one of several pre-film animation devices that produce the illusion of motion by displaying a sequence of drawings or photographs showing progressive phases of that motion. It was basically a cylindrical variation of the phénakisticope, suggested almost immediately after the stroboscopic discs were introduced in 1833. The definitive version, with easily replaceable picture strips, was introduced as a toy by Milton Bradley in 1866 and became very successful.
The RBMK is a class of graphite-moderated nuclear power reactor designed and built by the Soviet Union. The name refers to its unusual design where, instead of a large steel pressure vessel surrounding the entire core, the core is surrounded by a cylindrical annular steel tank inside a concrete vault and each fuel assembly is enclosed in an individual 8 cm diameter pipe surrounded in graphite which allows the flow of cooling water around the fuel.
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.
An alidade or a turning board is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to triangulate a scale map on site using a plane table drawing of intersecting lines in the direction of the object from two or more points or to measure the angle and horizontal distance to the object from some reference point Polar measurement. Angles measured can be horizontal, vertical or in any chosen plane.
The M48 Patton is an American first generation main battle tank (MBT) introduced in February 1952, being designated as the 90mm Gun Tank: M48. It was designed as a replacement for the M26 Pershing, M4 Sherman variants and M46 Pattons used in the Korean War, and as the successor to the M47 Patton. Nearly 12,000 M48s were built, mainly by Chrysler and American Locomotive Company, from 1952 to 1961. The M48 underwent many design modifications and improvements during its production life. This led to a wide variety of suspension systems, cupola styles, power packs, fenders and other details among individual tanks.
The Char 2C, also known as the FCM 2C, is a French heavy tank, later also seen as a super-heavy tank, developed during World War I but not deployed until after the war. It was, in total volume or physical dimensions, the largest operational tank ever made.
The Cupola is an ESA-built observatory module of the International Space Station (ISS). Its name derives from the Italian word cupola, which means "dome". Its seven windows are used to conduct experiments, dockings and observations of Earth. It was launched aboard Space Shuttle Endeavour's mission STS-130 on 8 February 2010, and attached to the Tranquility module. With the Cupola attached, ISS assembly reached 85 percent completion. The Cupola's central window has a diameter of 80 cm (31 in).
The Mark VIII tank also known as the Liberty or The International was a British-American tank design of the First World War intended to overcome the limitations of the earlier British designs and be a collaborative effort to equip France, the UK and the US with a single heavy tank design.
A smokebox is one of the major basic parts of a steam locomotive exhaust system. Smoke and hot gases pass from the firebox through tubes where they pass heat to the surrounding water in the boiler. The smoke then enters the smokebox, and is exhausted to the atmosphere through the chimney. Early locomotives had no smokebox and relied on a long chimney to provide natural draught for the fire but smokeboxes were soon included in the design for two main reasons. Firstly and most importantly, the blast of exhaust steam from the cylinders, when directed upwards through an airtight smokebox with an appropriate design of exhaust nozzle, effectively draws hot gases through the boiler tubes and flues and, consequently, fresh combustion air into the firebox. Secondly, the smokebox provides a convenient collection point for ash and cinders ("char") drawn through the boiler tubes, which can be easily cleaned out at the end of a working day. Without a smokebox, all char must pass up the chimney or will collect in the tubes and flues themselves, gradually blocking them.
The Char B1 was a French heavy tank manufactured before World War II.
The Hotchkiss H35 or Char léger modèle 1935 H was a French cavalry tank developed prior to World War II. Despite having been designed from 1933 as a rather slow but well-armoured light infantry support tank, the type was initially rejected by the French Infantry because it proved difficult to steer while driving cross-country, and was instead adopted in 1936 by the French Cavalry arm.
The ARL 44 was a French heavy tank, the development of which started just before the end of the Second World War. Only sixty of these tanks were ever completed, from 1949 onwards. The type proved to be unsatisfactory and was phased out in 1953.
The Char G1 was a French replacement project for the Char D2 medium tank. Several prototypes from different companies were developed from 1936 onwards, but not a single one had been fully completed at the time of the Fall of France in 1940. The projects represented some of the most advanced French tank design of the period and finally envisaged a type that would have been roughly equal in armament and mobility to later World War II standard tanks of other nations, such as the Soviet T-34 and the American M4 Sherman, but possessing several novel features, such as gun stabilisation, a semi-automatic loader and an optical rangefinder.
The AMX-40 was a French main battle tank developed by GIAT during the latter stages of the Cold War as an export tank to replace the earlier AMX-32. Designed to be an inexpensive tank orientated towards militaries with smaller defence budgets, the AMX-40 featured a lightly armoured hull and good mobility reminiscent of previous French MBTs with a powerful 120 mm cannon. It however failed to attract interest and sales, rendering the project a failure, being discontinued in 1990.
Oxy-fuel welding and oxy-fuel cutting are processes that use fuel gases and oxygen to weld or cut metals. French engineers Edmond Fouché and Charles Picard became the first to develop oxygen-acetylene welding in 1903. Pure oxygen, instead of air, is used to increase the flame temperature to allow localized melting of the workpiece material in a room environment. A common propane/air flame burns at about 2,250 K, a propane/oxygen flame burns at about 2,526 K, an oxyhydrogen flame burns at 3,073 K and an acetylene/oxygen flame burns at about 3,773 K.
The AMX 50 or AMX-50 was a French heavy tank designed in the immediate post Second World War period. It was proposed as, in succession, the French medium, heavy, and main battle tank, incorporating many advanced features. It was cancelled in the late 1950s however, due to unfavourable economic and political circumstances after serious delays in development.
A loading arm permits the transfer of liquid or liquefied gas from one tank to another through an articulated pipe system consisting of rigid piping and swivel joints to obtain flexibility.
The LT vz. 34, formally designated as Lehký tank vzor 34 was a Czechoslovak-designed light tank used mainly by Slovakia during World War II. Its suspension was based on that of the Carden-Loyd tankette, of which the Czechs had purchased three, plus a manufacturing license, in 1930. Dissatisfied with the prototypes of the Tančík vz. 33 tankette, the Czech Army decided that it would be easier to design a light tank from scratch rather than modify a tankette's chassis to carry a fully rotating armored turret. 50 were built, the last of which was delivered during 1936, of which the Germans captured 22 - including the prototype, when they occupied Bohemia-Moravia in March 1939, but they promptly scrapped them. The Slovaks seized the remaining 27 when they declared independence from Czechoslovakia at the same time. In Slovak service it only saw combat during the Slovak National Uprising.
The Halcyon RB80 is a non-depth-compensated passive addition semi-closed circuit rebreather of similar external dimensions to a standard AL80 scuba cylinder. It was originally developed by Reinhard Buchaly (RB) in 1996 for the cave exploration dives conducted by the European Karst Plain Project (EKPP).
The AMX Tracteur C was a super-heavy tank designed by Ateliers de construction d'Issy-les-Moulineaux(AMX).
